MySQL Indexes – Multi-column indexes and order of columns
The problem: Many a times people find that they create index but the query is still slow or the index is not being used by MySQL to fetch the result-set. Mostly the reason is that the index is not...
View ArticleMySQL Query Optimization – Tip # 1 – Avoid using wildcard character at the...
The more I go through others SQL, there are some common mistakes that I see developers making over and over again, so I thought why not start a series of tips that can help developers optimize their...
View ArticleUnderstanding InnoDB clustered indexes
Some people don't probably know, but there is a difference between how indexes work in MyISAM and how they work in InnoDB, particularly when talking from the point of view of performance enhancement....
View ArticleOn Covering Indexes and Their Impact on Performance
The purpose of this post is to describe what covering indexes are and how they can be used to improve the performance of queries. People mostly use indexes to filter or sort the results but not much...
View ArticleUnderstanding B+tree Indexes and how they Impact Performance
Indexes are a very important part of databases and are used frequently to speed up access to particular data item or items. So before working with indexes, it is important to understand how indexes...
View ArticleWhen EXPLAIN estimates can go wrong!
This is the title of my first blog post on MySQL Performance Blog. It deals with a customer case where the customer was facing a peculiar problem where the rows column in the EXPLAIN output of the...
View ArticleIndex Condition Pushdown in MySQL 5.6 and MariaDB 5.5 and its performance impact
I have been working with Peter in preparation for the talk comparing the optimizer enhancements in MySQL 5.6 and MariaDB 5.5. We are taking a look at and benchmarking optimizer enhancements one by one....
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